[ 436 ] 
4« Light thrown on the march of a chofen hygrometer, by comparing it with the 
correfpondent changes in weight of many hygrofcopic fubftances, ibid. 
Reverfions . See Survivor fisips . 
Ridlington , in Rutland, bed of chalk difcovered near, p, 281, Flints found about Rid- 
lington not fo black as thole of the more fouthern counties of England, p. 281. 
Roxburgh , Dr. on the Chermes Lacca, p. 228. 
S. 
Selbouru, in Hampihire, abftraCt of a regider of rain kept at, for the year 1789^. 89. 
Series, infinite, obfervations on, d. 146. See Infinite Series . 
Shoerl , a fubflance common both to bafaltes and granite, p. 54. 
Solutions of problems relating to furvivorfhips, p.248, 253, 256, 258, 262, 263,263, 
267, 269, 272. Solutions of problems refpeCting angles, p. 290, 291. 
Solutions of propofitions relating to infinite fer ies, p. 299, 300, 302, 303, 309, 31c, 
3 1 ?, 312, 314. 
Squid , a fifh, fuppofed to be the food of the fpermaceti whale, p. 44, 46 
Stars , nebulous obfervations on, p. 71. Milky-way confifts intirely of flars, ibid. 
Sugar , has an affinity with water, and no fenfible one with alcohol, p. 11. Water, 
entering fugar, by the faculty of its capillary pores diffiolves it, ibid. Alcohol, 
entering lugar, by the fame means, evaporates, and leaves the fugar fenfibly as it was 
before, ibid. 
Sulphur of antimony no ways necefiary to the formation of James’s powder, p. 360. 
Survivorjhips . On the method of determining, from the real probabilities of life, the 
values of contingent reverfions in which three lines are involved in the furvivorfhip, 
p, 246. 
T. 
Tabajheer , chemical experiments on, p. 368. Hydrabad Tabafheer refembles fragments 
of Cacholong, p. 369, Of a difagreea’ole earthy tafle, refembling that of magnefia, 
ibid. Experiments on Tabafheer treated with water, p. 370. With vegetable 
colours, 371 . At the fire, ibid. With acids, p. 373. With liquid alkalies, p. 373 
With dry alkalies, p. 379. With other fluxes, p. 380. 
’Tables. 
A table of hygrofcopic and thermofcopic refults, p. 33. 
A table of hygrofcopic refults, on whalebone, quill, and deal, p. 33. 
Meteorological journal, principally relating to atmofpheric electricity, kept at 
Knightfbridge, from May 9, 1789, to May 8, 1790, p.189—210. 
Table containing a monthly account of electrical fparks, and of pofitive and nega- 
tive electricity, as indicated by a pith-ball electrometer, and fomedmes by only 
flaxen threads without balls to them, p. 21 1. 
Tab If 
